I haven't open carried in one of my kilts, yet. I have, however, carried concealed in a Wilderness Safepacker. I haven't checked to see if my Blackhawk Serpa CQC holster would fit on the extra-wide belt that I usually wear with my kilts.
Wilderness Safepacker: http://store.thewilderness.com/index.php?cPath=51
Blackhawk CQC Serpa: http://blackhawk.com/product/SERPA-C...,1145,1410.htm